Structure, optical properties and energy transfer in potassium-alumino-borotellurite glasses doped with Eu3+ ions
Journal: Journal of Luminescence
Author: Nguyen Thi Hien
KABxTyE (xB2O3+yTeO2 +10K2O+10Al2O3 +0.5Eu2O3) glasses with the variation of B2O3/TeO2 ratios (x/y = 30/50, 40/40 and 50/30) and KABTzEu glasses ((50-z)B2O3+30TeO2+10Al2O3+10K2O + zEu2O3, with z = 0.1, 0.5, 1.0, 2.0, 3.0, 4.0 and 5.0 mol%) were prepared by melt–quenching technique. The structure of glasses was analyzed through X-ray diffraction (XRD) patterns, Fourier-transform infrared spectroscopy (FTIR) and phonon-sideband (PSB) spectra. The Judd-Ofelt (JO) theory was used to estimate the properties of ligand and the radiative parameters of prepared glasses such as lifetime (τcal), effective line width (Δλeff), stimulated emission cross-section (σP), gain bandwidth (σP × Δλeff), optical gain (σP × τcal) and quantum efficiency (η). The influence of B2O3/TeO2 ratio and Eu3+ concentration on structure and optical properties of materials was discussed in detail. Energy transfer process between Eu3+ ions was studied by using Inokuti-Hirayama and Yokota-Tamimoto models. The energy transfer channels between Eu3+ ions were also proposed.